A key to room-temperature ferromagnetism in Fe-doped ZnO: Cu

Details A key to room-temperature ferromagnetism in Fe-doped ZnO: Cu A key to room-temperature ferromagnetism in Fe-doped ZnO: Cu

2002-08-21

arxiv.org/abs/cond-mat/0208399v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures; to appear in Appl. Phys. Lett

Scientific paper

10.1063/1.1525885

Successful synthesis of room-temperature ferromagnetic semiconductors, Zn$_{1-x}$Fe$_{x}$O, is reported. The essential ingredient in achieving room-temperature ferromagnetism in bulk Zn$_{1-x}$Fe$_{x}$O was found to be additional Cu doping. A transition temperature as high as 550 K was obtained in Zn$_{0.94}$Fe$_{0.05}$Cu$_{0.01}$O; the saturation magnetization at room temperature reached a value of $0.75 \mu_{\rm B}$ per Fe. Large magnetoresistance was also observed below $100 $K.

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